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Thread: Gearing Lesson

  1. #1
    RC poster
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    Gearing Lesson

    Hey Guys

    Can Someone give me a short Gearing Lesson ?

    For example my Nitro Slash has a 72T Spur Gear and a 20T Clutch Bell

    If i use a smaller or bigger Clutch Bell what would happen ? would it get faster on top end or gain more torque on the low end.

    Samething for the Spur Gear if i were to go smaller or bigger what would happen ?

    Thanks

  2. #2
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    I'm guessing it comes down to, with that 20T, moving the spur gear 20 times per rotation, so with a 24T you move it 24 times per rotation, thus giving higher top end speed. Same concept for the spur, if you lose teeth you will gain high end

  3. #3
    RC poster
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    I've figured it out, But just incase anyone else whats to
    benefit from what I've learned then here ya to.

    Figuring Gear Ratios

    Key
    * = Divide
    x = Muiltiply

    Gear Ratio = Spur Gear * Teeth On Clutch Bell

    Final Drive Ratio = Transmission Ratio x Gear Ratio

    More Top End = Smaller Final Drive Ratio. (AKA Tall Gearing)

    More Low End = Larger Final Drive Ratio. (AKA Short Gearing)

    I'll use my slash as an example

    My Transmission Ratio = 2.81
    My Spur Gear = 72T
    My Clutch = 20T

    72 * 20 = 3.6
    2.81 x 3.6 = 10.1

    So my Final Drive Ratio is 10.1:1

    Getting that number lower will give me more top end speed

    Getting that number higher will give me more low end speed and torque on acceleration.

    You still have to be careful becuz if you gear it to high I'm sure you could blow your engine.

  4. #4
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    Quote Originally Posted by Housemaster View Post
    I'm guessing it comes down to, with that 20T, moving the spur gear 20 times per rotation, so with a 24T you move it 24 times per rotation, thus giving higher top end speed. Same concept for the spur, if you lose teeth you will gain high end
    You've got the right idea but there's still a little math involved.

    72 divided by 20 = 3.6

    What all this means is that the pinion gear must turn 3.6 times to make the spur gear turn once.

  5. #5
    Marshal Double G's Avatar
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    I've mentioned dozens of other times in the past: think of the clutch bell/pinion gears being attached to the pedals of your bicycle and the rear gearset is like the spur gear. Change gears and what happens?
    The Super Derecho

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